I am building a multiplayer based fps game and for the basic players data such as KDR and unlocked weapons and the leaderboard I wish I can use my google drive 15 gb free file hosting for that, is there any way to uplode/edit/download files from google drive in unity itself? please help thank you 
There is no need to do this. actually, google play service allow you to implement leaderboard and save your data into cloud.here is the helpful asset.